Faseroptisches Temperaturmessgerät für das U-Bahn-Stromnetz, Systemhersteller, Lieferant

The subway power system generally consists of electrical equipment such as circuit breakers, Transformatoren, rectifier cabinets, Kabel, busbars, etc. They are connected to each other by busbars, leads, Kabel, etc. The current flowing through the conductors and connecting parts will generate heat. Electrical equipment may have excessive local resistance due to long-term use or loose connections. When a large current passes through, it will generate high temperatures and even burn out the equipment. Deshalb, the quality of the conductor connection part is the key to endangering the safe operation of the power supply system, and it is also the key to the online monitoring system of power supply equipment. The main forms of faults in power supply equipment are:

1. The main forms of faults in the circuit breaker cabinet are: eccentric and loose insertion of isolation plugs on the upper and lower parts of the circuit breaker cabinet, causing overheating, poor contact between the circuit breaker and external cable joints, resulting in heating and equipment damage.

2. The main forms of faults in transformers and rectifier cabinets are: poor contact of cable joints and conductor connections leading to overheating, accelerated insulation aging leading to breakdown, resulting in phase to phase short circuits, and even equipment burning.

3. The form of cable failure in crossing tracks through pipes is: damage occurs during cable crossing due to construction or external forces, displacement and wear of the cable due to train operation vibration, and maintenance personnel cannot detect the damage to the cable inside the pipe. Under long-term current thermal effects, this damage gradually expands and deepens, leading to multiple grounding points of the cable metal sheath, resulting in circulating current in the protective layer, increasing the loss of the sheath, and in severe cases, causing the cable to overheat and burn out.

4. The form of cable failure on the upper rail is: the connection between the upper rail cable and the contact rail is not tightly pressed or gradually loosened due to harsh outdoor environments, resulting in poor contact and heating. This not only affects the quality of power supply, but can even cause equipment damage due to ignition when overheated.

5. DC grid switch cabinet: Due to design reasons, it is not possible to monitor the position status of the equipment once (in this case, the auxiliary switch contact is abnormal and cannot be switched in place, and the defect situation cannot be grasped in a timely manner). It may be due to inadequate closing, resulting in poor contact of the conductor and burning, incomplete opening, resulting in incomplete power outage, causing accidental injury or electric shock accidents.

Monitoring methods for power supply equipment

1. Online monitoring of circuit breaker cabinet

9-point method: Monitor the engagement of 6 dynamic and static contacts and 3 inlet and outlet cable joints.

2. Online monitoring of transformers and rectifier cabinets

6-point and 9-point: Monitor all incoming and outgoing cable joints.

3. Invisible monitoring of cable insulation through rails and pipes

Using distributed optical fiber to monitor the insulation condition of the cable passing through the conduit section of the track passing cable.

4. Online monitoring of cable connection quality at three rail points

Monitor the connection quality between the upper rail cable and the contact rail connection point.

5. Online monitoring of DC grid switchgear

Monitor the position of the isolation switch.

Why does the traction power supply system of rail transit need to use fluorescent fiber optic temperature measurement

Die Stromversorgungssysteme für die Bahnstromversorgung im städtischen Schienenverkehr in China sind DC750V und DC1500V, entsprechend den aktuellen Sammelmethoden des dritten Schienen- und Oberleitungsnetzes, beziehungsweise. Die maximale Spannung der Sekundärwicklung des Transformators dieses Stromversorgungssystems hat 1000 V überschritten, Der in der Spalte “Elektronisch Temperaturregler for Transformers” (JB/T7631-2016), die Pt100 als Temperatursensor verwendet, kann nur auf unter 1000V begrenzt werden. Deshalb, Der Schienenverkehr stellt höhere Anforderungen an den Spannungswiderstand für Temperatursensorfühler und -leitungen.

The fiber optic temperature controller for rail transit uses FJINNO’s fluoreszierender faseroptischer Temperatursensor as the temperature sensing element. Dieses Temperaturmesselement ist immun gegen elektromagnetische Störungen und resistent gegen Hochspannung (100KV/Glasfaser-zu-Erde-Leitungsabstand von 0,4 m). Die faseroptische Fluoreszenz-Temperaturmessung unterbindet vollständig die Interferenz von Temperaturmesselementen, die von der Temperaturmessquelle an den Temperaturregler übertragen werden, Verbesserung des Sicherheitsniveaus des Schienenverkehrs.

Vorteile von Fluoreszierendes faseroptisches Temperaturmesssystem Anwendung im Schienenverkehr

Für die Betriebsumgebung von Transformatoren für den Schienenverkehr, Die Isolierung und Abschirmung von externen elektrischen Störsignalen wird von der Stromversorgung aus erreicht, Ende des Signaleingangs, Ende des Signalausgangs, und Temperierkastengehäuse.

Das Stromversorgungssystem der Bahnstromversorgung des Schienenverkehrs basiert auf DC750V und DC1500V, Während der in der “Elektronischer Temperaturregler für Transformatoren” (JB/T7631-2005), die Pt100 als Temperatursensor verwendet, kann nur auf unter 1000V begrenzt werden. Deshalb, Der faseroptische Temperaturregler verfügt über einen extrem starken Spannungswiderstand und kann 100 kV standhalten.

Als Reaktion auf Vibrationen, Staub, Feuchtigkeit, Ölverschmutzung und andere Arbeitsumgebungen auf der Baustelle, multi-layer protective measures are taken to ensure that the optical fiber temperature controller for rail transit has good electromagnetic compatibility, Sicherstellung eines stabilen und zuverlässigen Betriebs des Temperaturreglers.

Faseroptischer Temperatursensor, Intelligentes Überwachungssystem, Verteilter Glasfaserhersteller in China